I'm terrified that this somehow seems acceptable to a large group of people.

I'm baffled that other IP holders (say those who own valuable pieces of proprietary software, or music, or movies, or even the LLMs themselves) don't think leopards will come eat their faces next. This erosion of IP has to stop, or anyone who does any intellectual work will be absolutely screwed. If that only meant FOSS people, I'd be worried that we'd just be thrown out with the bathwater – but surely this applies across the board!?